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Edimax EW-7722UnD Manual

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4-3 Glossary
1. What is the IEEE 802.11g standard?
802.11g is the new IEEE standard for high-speed wireless LAN communications that
provides for up to 54 Mbps data rate in the 2.4 GHz band. 802.11g is quickly
becoming the next mainstream wireless LAN technology for the home, office and
public networks.
802.11g defines the use of the same OFDM modulation technique specified in IEEE
802.11a for the 5 GHz frequency band and applies it in the same 2.4 GHz frequency
band as IEEE 802.11b. The 802.11g standard requires backward compatibility with
802.11b.
The standard specifically calls for:
A. A new physical layer for the 802.11 Medium Access Control (MAC) in the 2.4 GHz
frequency band, known as the extended rate PHY (ERP). The ERP adds OFDM as
a mandatory new coding scheme for 6, 12 and 24 Mbps (mandatory speeds), and
18, 36, 48 and 54 Mbps (optional speeds). The ERP includes the modulation
schemes found in 802.11b including CCK for 11 and 5.5 Mbps and Barker code
modulation for 2 and 1 Mbps.
B. A protection mechanism called RTS/CTS that governs how 802.11g devices and
802.11b devices interoperate.
2. What is the IEEE 802.11b standard?
The IEEE 802.11b Wireless LAN standard subcommittee, which formulates the
standard for the industry. The objective is to enable wireless LAN hardware from
different manufactures to communicate.
3. What does IEEE 802.11 feature support?
The product supports the following IEEE 802.11 functions:
CSMA/CA plus Acknowledge Protocol
Multi-Channel Roaming
Automatic Rate Selection
RTS/CTS Feature
Fragmentation
Power Management
4. What is Ad-hoc?
An Ad-hoc integrated wireless LAN is a group of computers, each has a Wireless LAN
card, Connected as an independent wireless LAN. Ad hoc wireless LAN is applicable
at a departmental scale for a branch or SOHO operation.
5. What is Infrastructure?
An integrated wireless and wireless and wired LAN is called an Infrastructure
configuration. Infrastructure is applicable to enterprise scale for wireless access to
central database, or wireless application for mobile workers.
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